Bubbles,
You can use a
KleenRite TIKR402.
Big Leo
That's a 24 volt timer. That would require a transformer and if it operates a compressor rather than just a solenoid valve, a relay as well.
The paraplate timer is a little cheaper $67.99 than the
Kleen rite TIK403, and can handle both 24 V and 110.
I have some old line Fragramatics air machines as well as JE ADAMS units. If they did not come with Paraplates, over the years tey have all been switched over.
I also use the
Kleen Rite IM 783
coin mech $23.50
I use only Thomas compressors. They are not cheap but Hold up great with heavy use for 10 plus years.
The hardest and most important part of the machine is the security the casing will provide. As indicated before my air chucks do not hold pressure. Air comes out as soon as the compressor runs. This is much easeir on the small compressor. If you are using your main compressor and just a solenoid valve this is of little concern. In that eventy I wouild suggest that the valve and timer be inside the building and just run wires to the
coin Mech in the case outside. That way you can have a really smal unit outside, just big enough for the
coin mech and $